在JSON中改变对象（AngularJS）

Question

我想让我的问题以随机顺序显示。我做到了，但它不能正常工作，有时没有遍历所有对象和停止等

$scope.move = function (direction) { 
    var position = $scope.allData.indexOf($scope.currentQ); 
    $scope.currentQ = $scope.allData[position + direction]; 
}; 

$http.get("js/json/questions.json").then(function(response){ 
    $scope.allData = response.data; 
    $scope.currentQ = $scope.allData[Math.floor(Math.random() * response.data.length)]; 
}); 

$scope.answerClick = function(index){ 
    $scope.clicks++; 

    if(index === $scope.currentQ.answer){ 
     $scope.score++; 
     $scope.rightwrong = "Right"; 
     $('.right-wrong').css("color", "green"); 
    } 
    else{ 
     $scope.rightwrong = "Wrong"; 
     $('.right-wrong').css("color", "red"); 
    } 

    if($scope.clicks === 4){ 
     resultService.score = $scope.score; 
     $location.path('/finish'); 
    } 

    $scope.move(+1); 
}; 

这里是整个应用程序：http://plnkr.co/edit/wTQHOz

Answer 1

在move方法，你可以超出阵列的范围。使其环绕，如果你的最后一个问题之前，首先或后移至：

$scope.currentQ = $scope.allData[(position + direction + $scope.allData.length) % $scope.allData.length];